I think the book took place in a library? Maybe. I definitely remember Renfield's name being flipped around. Thanks!
This is Prison of Vampires by Nancy Garden.
While writing a term paper on vampires, twelve-year-old Alexander finds himself falling under the spell of Dracula and his family of vampires who are operating a funeral parlor in Massachusetts.
On of the main characters is a Mr. Dleifner
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Yes, that's it! Thanks for solving a mystery that's plagued me for years! – Splitting Adam Jul 1 '15 at 19:55
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